Ph.D, T., R., B., J.(2007).501 ENGLISH VERBS: FULLY CONJUNGATED AN ALL THE TENSES IN AN EASY-TO-LEARN FORMAT ALPHABETICALLY ARRANGED .Jakarta:Binarupa Aksara.
Gaya MLA
Ph.D, Thomas, R., Beyer,, Jr,."501 ENGLISH VERBS: FULLY CONJUNGATED AN ALL THE TENSES IN AN EASY-TO-LEARN FORMAT ALPHABETICALLY ARRANGED".Jakarta:Binarupa Aksara,2007.Buku Inti.